加氢脱芳精制溶剂油的研究

采用催化加氢的方法脱除溶剂油中的芳烃,应用Ni—A1催化剂,在200mL加氢反应装置上分别考察了不同操作条件下120#溶剂油催化加氢脱芳烃的效果。结果表明：在反应压力为2．0～5．0MPa,反应温度为140-180℃,氢油体积比为150～500,空速为1．0～2．0h。的条件下,催化加氢脱芳烃的效果较好,其精制油的芳烃含量可控制在0．1％（质量分数）以下。     

聚合釜机械密封的改进

1.聚合釜密封由于聚合釜内发生化学反应,会引起压力、温度及物料形态的波动,机械密封位于聚合釜上部,处于气相介质中,工况条件最为恶劣。聚合反应是放热过程,且机械密封所处环境温度较高（釜内温度80℃）,密封面相互摩擦产生热量,润滑条件差,密封容易处于干摩擦状态。     

维修技术信息

应用微机控制漆包机生产线收到了较好效果郑州电磁线厂顾田报道:该厂在电磁线生产线上应用 TP—801单板机控制漆包机设备,使生产工艺过程的“三度”(温度、速度、漆的粘度)指标得到合理控制,提高了产品质量,降低了工人劳动强度。温度控制:软化炉、烘干炉在工艺规定范围内达到±5℃,漆缸达到±1℃;速度控制:可随电网的电压及温度变化自     

副产六甲基二硅醚制备三甲基氯硅烷新技术

采用新的管式反应器装置代替釜式反应器,将生产7-ADCA和7-ACA的副产物六甲基二硅醚有效地转化成了三甲基氯硅烷。与釜式反应器相比,管式反应器装置省去了搅拌,简化了生产工序,减少了催化剂的损失,增大了催化剂重复使用次数,操作简便,催化效率高。对反应条件进行了优化,在n(六甲基二硅醚)∶n(氯化锌)为1∶0.06、反应温度为-2~0℃、反应时间为3 h、通氯化氢速度为20 mL/min条件下,三甲基氯硅烷收率高达86.8%。     

发电机转子护环非正常外移的处理

南京汽轮电机厂生产,型号为QF2-12-2的发电机,1998年大修时,发现发电机转子护环外移1—2mm,压板螺栓断裂。导致一块止退压板脱落,现场处理办法如下:(1)安装好随机提供的拉转子护环专用工具;(2)用四把特大号焊枪,对着护环紧配位置均匀加热到200～250℃左右。加热温度实际值,可用一根火柴紧贴温度区,如果立刻引燃,说明温度在200℃以上,或者用普通5A保险丝,如果立刻熔化,说明温度已达到250℃左右;(3)装上另一侧专用工具,均匀拉紧,直到恢复设     

弯曲轴的校正

阿法米生产线传送带的驱动轴是由材质为0Cr19Ni9的实心轴1与空心轴2焊接而成的,并在空心轴的外表面包覆一层硅橡胶(耐热温度-90～250℃,硬度为45～85邵尔),其结构如图所示。购进时该设备为整体包装,由于长途(3000多公里)运输,并不断颠波,加之驱动轴自重约116kg,使其左端产生变曲变形 6～7.5mm。     

偏苯三酸酐开发利用前景广阔

苯三酸酐又名１，２，４－苯三甲酸酐，简称偏酐ＴＭＡ，外观为白色或微黄色针状结晶体，分子式Ｃ９Ｈ４Ｏ５，分子量１９２．１２，熔点１６１～１６３℃，沸点２４０～２４５℃／０．１８Ｍｐａ，闪点２２０℃。溶于水、乙醇、丙酮、二甲基甲酰胺、醋酸乙酯，微溶于甲苯、四氯化碳和石油醚，有毒，对皮肤粘膜有刺激性，在空气中的最高允许浓度为１ｍｇ／ｍ３。偏苯三酸酐的化学性质与苯酐相似，可与醇反应生成酯或聚酯，与碱反应生成盐，与氨胺反应生成酰胺—酰亚胺，在催化剂作用下与烃发生缩合反应等。偏苯三酸酐简称ＴＭＡ…     

Ineos开发和改进流化床和固定床体系顺酐催化剂

Ineos技术公司开发了改进型生产顺酐的流化床和固定床体系催化剂。该公司称工业化装置验证丁烷制顺酐收率明显提高，与老一代催化剂相比，采用改进的催化剂，反应器操作温度更低。Ineos公司称，预期这些改进可明显降低生产顺酐的操作费用并延长固定床催化剂寿命。收率的提高将取决于用户反应器的操作条件，Ineos公司验证该催化剂收率可提高10％，操作温度可下降100—300℃。新一代催化剂还适用于希望用丁烷取代苯作为顺酐生产原料的生产厂商。     

相转移催化合成苯乙腈的研究

利用相转移催化剂苄基三乙基氯化铵(TEBAC),对氯化苄与氰化钠制备苯乙腈的工艺条件进行了研究。结果表明:氯化苄、氰化钠、TEBAC的适宜物质的量的比为:1∶1.08∶0.003,反应时间为1h,温度为90～95℃,收率可达96%以上。     

俄罗斯环氧乙烷催化水合制备乙二醇技术

20 0 1年 5月初 ,俄罗斯门捷列夫化工大学ＳｈｖｅｔｓＶＦ教授等一行三人访问了上海石油化工研究院 ,就近几年俄罗斯石油化工的发展作了演讲 ,期间透露了该院开发研究的环氧乙烷催化水合制乙二醇技术。据介绍 ,目前 ,该院采用离子交换树脂为催化剂 ,在反应温度 80～ 1 3 0℃、压力 0 8～ 1 6ＭＰａ、水 /ＥＯ(ｍｏｌ比 )为 3～ 7:1、ＬＨＳＶ 1 0～ 3 0ｈ- 1 条件下 ,ＥＯ转化率大于 99% ,ＭＥＧ选择性已达 93 %～ 96 %。并通过对树脂类催化剂的改进 ,提高了催化剂的时空产率和催化剂的热稳定性 ,完成了中试装置上催化剂稳定性试验 ,已…     

Divergent patterns of engagement in Internet standardization: Japan,Korea and China

This article analyzes the engagement of Japanese, Korean and Chinese participants in the development of Internet standards at IETF on the basis of four quantitative metrics: attendance, patenting, authorship and leadership. The results are strikingly divergent. Japanese involvement in Internet standardization began early and Japan was, for many years, second only to the U.S. in terms of IETF participation. Though Japanese participation has declined since the early 2000s, Japan remains a major contributor to IETF standardization. Korean involvement in IETF has always been significant, but below the levels of Japan and major European countries. Korean participation in IETF has also declined over the past decade, and has been dominated by one firm, Samsung. Though meaningful Chinese involvement in IETF did not begin until the mid-2000s, it has rapidly expanded in recent years. Today, China is a major player in numerous areas of Internet standardization in terms of three metrics (participation, patenting and leadership), and is rapidly gaining in terms of document authorship as well. Most of China׳s recent IETF involvement can be attributed to Huawei, though other Chinese firms have recently begun to increase their participation in the organization. Thus, contrary to some views that China׳s engagement with standardization is primarily one of indigenous innovation and “catching up”, China׳s experience with IETF demonstrates deliberate and effective engagement with a major Western standards-development organization on its own terms.     

Whose Image is it Anyway?: Some Considerations of the Curricular Importance of Subject Image in Secondary School Design and Technology Education

This paper explores the idea that a sense of school subject image is a necessary feature of curriculum management and a potent force for change. The discussion centres on the view that all school subjects have an image and that if those intimately involved with the subject do not control the image then someone else does! In such circumstances the image is the product of past encounters and old euphemisms and is unlikely to hold the changed realities.The UK developments in Design and Technology education (the term Design and Technology is used to denote the school subject defined under this heading by the UK National Curriculum, 1995) have created something of an image problem which has interesting international parallels. Some of these problems are due to clearly discernible internal tensions and an ambiguous relationship with other subject areas.Through greater attention to subject image internal controversies might be acknowledged and resolved, relationships with other subject areas can be more meaningfully understood and practitioners can be helped to make sense of curriculum change.     

快速成形技术的应用及热点分析

基于快速成形技术的原理,展示了快速成形技术在快速模具制造、金属零件直接成形、反求工程等领域的广泛应用,总结了快速成形制造技术研究的热点,即研发新材料和新设备、提高成形精度、建立RPM的反求工程系统、建立成形技术的统一标准和扩大成形技术的应用领域。     

增强Linux系统安全性的措施

L inux系统的安全取决于系统管理员如何来管理它。本文探讨了一系列可以增强安全性的技巧与策略 ,包括 :系统安装原则、BIOS安全、口令安全策略、设计帐户自动注销功能、文件系统和日志安全策略、使用 SSH及 TCP-WRAPPERS,隐藏系统信息、删除所有特殊帐户、关闭控制台程序、限制系统中的 SUID/ SGID程序等。本文最后向 L inux系统管理员提出了一些安全管理方面的建议     

HSE走进中国石油

企业管理水平的好坏直接影响着企业的经济效益,运用HSE管理能提高企业管理水平,HSE管理模式将健康,安全,环境三者视为一个有机的整体。HSE管理认为人的安全是第一位的,人是创造财富的原动力,是企业的最大财产,HSE管理体系强调的是“蝴蝶效应”。     

CIS与现代企业管理美学

概括性介绍了 ＣＩＳ（Ｃｏｒｐｏｒａｔｅ Ｉｄｅｎｔｉｔｙ Ｓｙｓｔｅｍ）的三大基本组成，并阐述了它与现代企业管理密不可分的相互联系及所处的举足轻重的地位，指出导入ＣＩＳ是现代企业谋求发展的重要手段。     

Material power and normative conflict in global and local agrifood governance: The lessons of ‘Golden Rice’ in India

This special section aims to investigate the interaction of global and local forces in shaping agrifood governance. It starts from the recognition that a multitude of actors and norms shape today’s agrifood system. The resulting opaqueness of the systems makes it extremely difficult to understand and explain processes and outcomes of agrifood governance. Given the sustainability challenges facing the agrifood system, improvements in our understanding of what the interaction of global and local actors and norms means on the ground are urgently needed, however. The section, therefore, analyses agrifood governance in India across a selected group of cases. It does so by employing a systematic framework emphasizing the material and ideational dimensions of power and their interaction. The section has chosen India as the setting in which to analyze this interaction due to the crucial role the food demand and supply of this rising power plays in today’s agrifood system. This article provides the special sections’ analytical framework, which uses the interplay of material and ideational dimensions of power as a focal lens. In addition, the article applies this framework to an empirical study of the political conflict around GMO foods in India, specifically the case of ‘Golden Rice’.     

蒸汽热量计量应用的探析

研究了石油化工企业的燕汽计量情况,着重对蒸汽热量计量的合理性进行了分析,阐述了蒸汽热量计量的依据及计算方法,以及蒸气热量计量对节能降耗的重要意义.     

论传统旗袍文化与现代时装

中国的旗袍文化蕴含着非常丰富的文化内涵和设计思想,如今旗袍的普及受到一定的限制,只有经过改良,才可变局限性为可行性,才可使旗袍焕发青春,走向新时代。     

望峰岗矿井贯通测量技术分析

在深部开采矿井两井间贯通测量时,利用加测陀螺定向边和用四架法代替传统的三架法测量,分析了由起始边的方位角误差引起的支导线终点误差及由测角量边引起的导线终点的点位误差.